Table 2.

Pearson’s correlation coefficients between each catechin content (g/100 g dry leaves) and rat alpha-glucosidase inhibitory activity (%).

Pearson’s Correlation Coefficient
	Each Infusion Method
Catechins	70% EtOH (25 °C, 24 h)	H2O (25 °C, 24 h)	H2O (90 °C, 1.5 min)
EC	−0.45	0.31	0.13
EGC	−0.24	−0.01	0.21
(+)C	−0.53	0.44	0.30
GC	−0.48	0.13	0.36
Free form	−0.29	0.15	0.35
ECg	0.74 **	0.78 *	0.92 ***
EGCg	0.83 ***	0.69 *	0.95 ***
GCg	−0.11	−0.25	0.63 *
Gallate form	0.83 ***	0.71 **	0.95 ***
Total catechins	0.61 *	0.49	0.74 *

* p < 0.05, ** p < 0.01, and *** p < 0.001 indicate significant Pearson correlation.